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    <title>javascript 学习</title>
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    <h2>第一章</h2>
    <ul>
        <li><a href="ch01/a.html">严格模式</a></li>
        <li><a href="ch01/b.html">数据类型</a></li>
        <li><a href="ch01/c.html">Object对象</a></li>
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